メタデータ
| 項目 |
値 |
| Designation |
C/1988 F1 (Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1987-11-29T22:34:57.907200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:36Z |
| Obs used |
37 |
| NEO |
- |
| M1 |
4.800 |
| K1 |
19.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1988-05-22.0000000 |
| e |
0.99771483 |
| q (au) |
1.174205 |
| a (au) |
513.837337 |
| i (deg) |
62.807742 |
| Ω (om, deg) |
288.763862 |
| ω (w, deg) |
326.514381 |
| M (ma, deg) |
0.014729 |
等級
散乱 + 全体線形
$$
M_a = (11.001 + 2.109\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.001 |
| n |
2.109 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
04:49:18.29 |
+64:39:41.1 |
HIP 22191 |
18.85 |
| 2026-03-26 12:00 |
04:49:19.95 |
+64:39:23.5 |
HIP 22191 |
18.98 |
| 2026-03-27 00:00 |
04:49:21.64 |
+64:39:06.0 |
HIP 22191 |
19.12 |
| 2026-03-27 12:00 |
04:49:23.36 |
+64:38:48.5 |
HIP 22191 |
19.27 |
| 2026-03-28 00:00 |
04:49:25.12 |
+64:38:31.2 |
HIP 22191 |
19.42 |
| 2026-03-28 12:00 |
04:49:26.92 |
+64:38:13.9 |
HIP 22191 |
19.59 |
| 2026-03-29 00:00 |
04:49:28.75 |
+64:37:56.8 |
HIP 22191 |
19.76 |
| 2026-03-29 12:00 |
04:49:30.61 |
+64:37:39.7 |
HIP 22191 |
19.94 |
| 2026-03-30 00:00 |
04:49:32.50 |
+64:37:22.7 |
HIP 22191 |
20.13 |
| 2026-03-30 12:00 |
04:49:34.43 |
+64:37:05.8 |
HIP 22191 |
20.33 |
| 2026-03-31 00:00 |
04:49:36.39 |
+64:36:49.1 |
HIP 22191 |
20.54 |
| 2026-03-31 12:00 |
04:49:38.39 |
+64:36:32.4 |
HIP 22191 |
20.75 |
| 2026-04-01 00:00 |
04:49:40.41 |
+64:36:15.8 |
HIP 22191 |
20.97 |
| 2026-04-01 12:00 |
04:49:42.47 |
+64:35:59.2 |
HIP 22191 |
21.20 |
| 2026-04-02 00:00 |
04:49:44.56 |
+64:35:42.8 |
HIP 22191 |
21.43 |
| 2026-04-02 12:00 |
04:49:46.69 |
+64:35:26.5 |
HIP 22191 |
21.67 |
| 2026-04-03 00:00 |
04:49:48.84 |
+64:35:10.3 |
HIP 22191 |
21.92 |
| 2026-04-03 12:00 |
04:49:51.03 |
+64:34:54.2 |
HIP 22191 |
22.17 |
| 2026-04-04 00:00 |
04:49:53.25 |
+64:34:38.2 |
HIP 22191 |
22.43 |
| 2026-04-04 12:00 |
04:49:55.50 |
+64:34:22.3 |
HIP 22191 |
22.70 |
| 2026-04-05 00:00 |
04:49:57.78 |
+64:34:06.5 |
HIP 22191 |
22.97 |
| 2026-04-05 12:00 |
04:50:00.09 |
+64:33:50.8 |
HIP 22191 |
23.25 |
| 2026-04-06 00:00 |
04:50:02.44 |
+64:33:35.2 |
HIP 22191 |
23.53 |
| 2026-04-06 12:00 |
04:50:04.81 |
+64:33:19.7 |
HIP 22191 |
23.82 |
| 2026-04-07 00:00 |
04:50:07.21 |
+64:33:04.4 |
HIP 22191 |
24.11 |
| 2026-04-07 12:00 |
04:50:09.65 |
+64:32:49.1 |
HIP 22191 |
24.41 |
| 2026-04-08 00:00 |
04:50:12.11 |
+64:32:33.9 |
HIP 22191 |
24.71 |
| 2026-04-08 12:00 |
04:50:14.61 |
+64:32:18.9 |
HIP 22191 |
25.01 |
| 2026-04-09 00:00 |
04:50:17.14 |
+64:32:03.9 |
HIP 22191 |
25.33 |
| 2026-04-09 12:00 |
04:50:19.69 |
+64:31:49.1 |
HIP 22191 |
25.64 |
| 2026-04-10 00:00 |
04:50:22.27 |
+64:31:34.4 |
HIP 22191 |
25.96 |
| 2026-04-10 12:00 |
04:50:24.89 |
+64:31:19.8 |
HIP 22191 |
26.29 |
| 2026-04-11 00:00 |
04:50:27.53 |
+64:31:05.3 |
HIP 22191 |
26.61 |
| 2026-04-11 12:00 |
04:50:30.20 |
+64:30:50.9 |
HIP 22191 |
26.95 |
| 2026-04-12 00:00 |
04:50:32.90 |
+64:30:36.7 |
HIP 22191 |
27.28 |
| 2026-04-12 12:00 |
04:50:35.63 |
+64:30:22.5 |
HIP 22191 |
27.62 |
| 2026-04-13 00:00 |
04:50:38.39 |
+64:30:08.5 |
HIP 22191 |
27.96 |
| 2026-04-13 12:00 |
04:50:41.17 |
+64:29:54.6 |
HIP 22191 |
28.31 |
| 2026-04-14 00:00 |
04:50:43.99 |
+64:29:40.8 |
HIP 22191 |
28.66 |
| 2026-04-14 12:00 |
04:50:46.83 |
+64:29:27.1 |
HIP 22191 |
29.01 |
| 2026-04-15 00:00 |
04:50:49.70 |
+64:29:13.6 |
HIP 22191 |
29.37 |
| 2026-04-15 12:00 |
04:50:52.59 |
+64:29:00.2 |
HIP 22191 |
29.73 |
| 2026-04-16 00:00 |
04:50:55.51 |
+64:28:46.9 |
HIP 22191 |
30.09 |